<?php
/**
 * ---------------------------------------------------------------------
 * GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2015-2020 Teclib' and contributors.
 *
 * http://glpi-project.org
 *
 * based on GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2003-2014 by the INDEPNET Development Team.
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * GLPI is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GLPI is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GLPI. If not, see <http://www.gnu.org/licenses/>.
 * ---------------------------------------------------------------------
 */

namespace Glpi\Features;

/**
 * Trait Kanban.
 * @since 9.5.0
 */
trait Kanban {

   /**
    * Get all data needed to display a Kanban for the item with the specified ID.
    * This function does not format the data for viewing in the kanban.
    * @since 9.5.0
    * @param int $ID ID of the item
    * @param array $criteria Array of criteria to restrict the data returned.
    *       For example, it can restrict based on a specific Kanban column field to only get data for a specific column.
    * @return array Array of the data.
    *       This can be in any format as long as the getKanbanColumns function in this class can interpret it.
    **/
   abstract static function getDataToDisplayOnKanban($ID, $criteria = []);

   /**
    * Get Kanban columns data for the specified item to pass to the Kanban JS component.
    * @since 9.5.0
    * @param int $ID ID of the item
    * @param string $column_field The field used to represent columns (Ex: projectstates_id).
    *       If no field is specified, the default columns are returned.
    * @param array $column_ids Array of Kanban column IDs that should be returned.
    *       By default, this array is empty which signifies that all columns should be retuned.
    * @param bool $get_default If true, the default columns are returned in addition to the requested ones in $column_ids.
    * @return array Array of constructed columns data for the Kanban
    **/
   abstract static function getKanbanColumns($ID, $column_field = null, $column_ids = [], $get_default = false);

   /**
    * Show Kanban for a single item, or a global view for the itemtype.
    * @since 9.5.0
    * @param int $ID ID of the item or -1 for a global view.
    * @return void|bool
    **/
   abstract static function showKanban($ID);

   /**
    * Get a list of all items to be included in the 'switch board' dropdown.
    * @since 9.5.0
    * @param bool $active True if only open/active items should be returned.
    * @param integer $current_id ID of the currently viewed Kanban.
    *       This is used to ensure the current Kanban is always in the list regardless of if it is active or not.
    * @return array Array of items that can have a Kanban view.
    *       Array format must be item_id => item_name.
    */
   abstract static function getAllForKanban($active = true, $current_id = -1);

   /**
    * Get a list of all valid columns (without items) for the column based on the specified column field.
    * @since 9.5.0
    * @param string $column_field The field used to represent columns (Ex: projectstates_id).
    *       If no field is specified, all columns are returned.
    * @param array $column_ids Array of column IDs to limit the result. These IDs are values of the column_field in the DB.
    * @return array Array of columns in the format:
    *       column_field => [id => [name, header_color, etc]]
    */
   abstract static function getAllKanbanColumns($column_field = null, $column_ids = [], $get_default = false);

   /**
    * Check if the current user can modify the global Kanban state.
    * @since 9.5.0
    * @return bool
    */
   public function canModifyGlobalState() {
      return false;
   }

   /**
    * Force the current user to use the global state when loading and saving (if they are allowed).
    * @since 9.5.0
    * @return bool
    * @see Kanban::canModifyGlobalState()
    */
   public function forceGlobalState() {
      return false;
   }

   /**
    * Modify the state before it gets saved to the DB.
    * You can deny the save completely by returning null or false.
    * @param array $oldstate The state currently in the DB.
    * @param array $newstate The new state to be saved.
    * @param int $users_id The ID of the user this state is for. If 0, it is the global/default state.
    * @return mixed The modified state or false/null to deny the save.
    */
   public function prepareKanbanStateForUpdate($oldstate, $newstate, $users_id) {
      return $newstate;
   }

   /**
    * Check if the current user can move Kanban cards inside the same column.
    * This is usually reserved for managers since the order can relate to priority.
    * @param integer $ID Item's ID
    * @return bool
    */
   public function canOrderKanbanCard($ID) {
      return true;
   }
}